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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 6,238,009   $ 6,256,757      
Allowance for loan losses (49,618) $ (48,103) (47,583) $ (47,451) $ (47,096) $ (47,233)
Net loans 6,188,391   6,209,174      
Credit impaired acquired loans, total balance due 7,900   13,400      
Accretable discount related to credit impaired acquired loans [Roll forward]            
Beginning Balance 976          
Accretion recognized, year-to-date (688)          
Net reclassification between accretable and non-accretable 326          
Ending Balance 614          
Business Lending [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 2,384,629   2,424,223      
Consumer Mortgage [Member] | Minimum [Member]            
Loans receivable, net [Abstract]            
Typical contract term 10 years          
Consumer Mortgage [Member] | Maximum [Member]            
Loans receivable, net [Abstract]            
Typical contract term 30 years          
Home Equity [Member] | Maximum [Member]            
Loans receivable, net [Abstract]            
Typical contract term 30 years          
Commercial Portfolio Segment [Member] | Business Lending [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 2,384,629   2,424,223      
Allowance for loan losses (10,473)   (10,465) (10,197)   (10,094)
Commercial Portfolio Segment [Member] | Consumer Mortgage [Member]            
Loans receivable, net [Abstract]            
Allowance for loan losses (10,473) (10,382)   (10,197) (10,149)  
Residential Portfolio Segment [Member] | Business Lending [Member]            
Loans receivable, net [Abstract]            
Allowance for loan losses (18,439) (17,607)   (17,230) (16,857)  
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 2,210,051   2,220,298      
Allowance for loan losses (18,439)   (17,257) (17,230)   (17,220)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,063,679   1,011,978      
Allowance for loan losses (14,424) (13,698) (13,468) (13,918) (13,996) (13,782)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 181,217   179,929      
Allowance for loan losses (3,164) (2,984) (3,039) (2,945) (2,852) (2,979)
Consumer Portfolio Segment [Member] | Home Equity [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 398,433   420,329      
Allowance for loan losses $ (2,015) $ (2,040) $ (2,107) $ (2,242) $ (2,359) $ (2,399)